Institutions for irrigation water management in Ethiopia: Assessing diversity and service delivery

Irrigation systems cannot en sure the equitable distribution of water among users and sustainable operation and maintenance of the schemes without capable irrigation institutions. In Ethiopia, traditional institutions have emerged with the expansion of traditional irrigation schemes and most of them were established and operated on the initiative of the farmers. These often have very limited financial and technical capacities. Current trends show that developing infrastructure is the major concern in irrigation development efforts. However, managing the schemes is largely overlooked, particularly for externally initiated irrigation schemes. Operation and maintenance of the irrigation schemes, particularly those at tertiary levels, are commonly not well set and often neglected or left to farmers without building their capacities. The overarching objectives of the study were to: i) assess the nature and diversity of irrigation institutions in the study schemes; ii) evaluate existing institutions service delivery with respect to selected attributes and draw useful lessons; and iii) identify appropriate interventions. This study focused on 10 irrigation schemes located in four regional states of Ethiopia (Tigray, Amhara, Oromia and SNNP). Various approaches were used to generate data required for this study, such as household interview, transect walk and systematic observation, focus group discussion, key informant interviews and the review of existing literature. We clustered the study schemes as modern, semi-modern and traditional, using selected criteria (operation and maintenance service delivery, managing financial service delivery, level of inequity) to generate empirical evidence for evaluation of their performances. The results found two forms of irrigation institutions: irrigation water users associations (IWUA) and irrigation cooperatives or water committee. More than 30% of the irrigation schemes considered in the study, regardless of their typology, had no institution. Membership in the irrigation institution for traditional schemes was 100%, while the average membership both in modern and semi-modern schemes was about 70% of the respondents. This contrasts with the new proclamation in Ethiopia on IWUA which suggest mandatory membership for any water user in a scheme. Without exception bylaws were either not detailed enough to address scheme specific problems or not recorded at all. Ambiguity associated with these, and probably presence of non-member water users, deterred the decision-making processes and the enforcement of rules and regulations for water use, thus create opportunities for free riders. This also explains the reason for occasional conflict between irrigators and the inequity of water distribution within scheme. In many cases, irrigation institutions service delivery limited to operational management and other services, such as financial management, were not common even at those schemes where irrigation fee exists. Problems associated with a lack of empirical evidence as to what to pay for and how much to pay and the application of flat rate—regardless of the amount of irrigation water used, which is not measured—and crop types grown as currently practised will not act as an incentive for prudent water use. Establishing the amount and types of irrigation water fees will be an important step to finance irrigation schemes. Understanding this diversity and these gaps and tailoring actions to local conditions is vital efforts to improve the service delivery of irrigation institutions in Ethiopia. Secondly, the service required for the sustainable management of irrigation schemes and mechanisms to operate them needs to be standardized

Protein quality of amaranth grains cultivated in Ethiopia as affected by popping and fermentation

The effect of popping and fermentation on protein quality of three different varieties of amaranth grains cultivated in Ethiopia was evaluated. Total lysine content of the grains was higher than that of commonly available cereals but close to that of legumes. Methionine and cysteine contents in the grains were also higher than that found in cereal and legume proteins. Percentage of total indispensable amino acids, excluding tryptophan, was 43% - 49%, which was higher than WHO reference pattern (31%). Popping resulted in 36% and 37% reduction in total lysine and cysteine contents, respectively, whereas fermentation reduced cysteine, lysine and methionine contents by 16%, 20% and 20%, respectively. From the free amino acids, histidine was the major indispensable amino acid but threonine was not detected. During popping, all free amino acids, except threonine, were reduced. On the other hand, fermentation significantly increased (p < 0.01) most amino acids except arginine, which was significantly decreased (p < 0.01), and tyrosine and glutamic acid, for which no change was observed. Popping decreased in vitro protein digestibility (IVPD) by 8.3% - 17.1% while fermentation increased IVPD by 4.8% - 7.5%. Substitution of amaranth for wheat and/or maize during complementary food formulation could contribute much to the daily requirements of indispensable amino acids of young children

Status of the ANAIS Dark Matter Project at the Canfranc Underground Laboratory

The ANAIS experiment aims at the confirmation of the DAMA/LIBRA signal. A detailed analysis of two NaI(Tl) crystals of 12.5 kg each grown by Alpha Spectra will be shown: effective threshold at 1 keVee is at reach thanks to outstanding light collection and robust PMT noise filtering protocols and the measured background is well understood down to 3 keVee, having quantified K, U and Th content and cosmogenic activation in the crystals. A new detector was installed in Canfranc in March 2015 together with the two previous modules and preliminary characterization results will be presented. Finally, the status and expected sensitivity of the full experiment with 112 kg will be reviewed.Comment: Contributed to the 11th Patras Workshop on Axions, WIMPs and WISPs, Zaragoza, June 22 to 26, 201

Background model of NaI(Tl) detectors for the ANAIS Dark Matter Project

A thorough understanding of the background sources is mandatory in any experiment searching for rare events. The ANAIS (Annual Modulation with NaI(Tl) Scintillators) experiment aims at the confirmation of the DAMA/LIBRA signal at the Canfranc Underground Laboratory (LSC). Two NaI(Tl) crystals of 12.5 kg each produced by Alpha Spectra have been taking data since December 2012. The complete background model of these detectors and more precisely in the region of interest will be described. Preliminary background analysis of a new 12.5 kg crystal received at Canfranc in March 2015 will be presented too. Finally, the power of anticoincidence rejection in the region of interest has been analyzed in a 4x 5 12.5 kg detector matrix.Comment: Contributed to the 11th Patras Workshop on Axions, WIMPs and WISPs, Zaragoza, June 22 to 26, 201

Production and relevance of cosmogenic radionuclides in NaI(Tl) crystals

The cosmogenic production of long-lived radioactive isotopes in materials is an hazard for experiments demanding ultra-low background conditions. Although NaI(Tl) scintillators have been used in this context for a long time, very few activation data were available. We present results from two 12.5 kg NaI(Tl) detectors, developed within the ANAIS project and installed at the Canfranc Underground Laboratory. The prompt data taking starting made possible a reliable quantification of production of some I, Te and Na isotopes with half-lives larger than ten days. Initial activities underground were measured and then production rates at sea level were estimated following the history of detectors; a comparison of these rates with calculations using typical cosmic neutron flux at sea level and a selected description of excitation functions was also carried out. After including the contribution from the identified cosmogenic products in the detector background model, we found that the presence of 3H in the crystal bulk would help to fit much better our background model and experimental data. We have analyzed the cosmogenic production of 3H in NaI, and although precise quantification has not been attempted, we can conclude that it could imply a very relevant contribution to the total background below 15 keV in NaI detectors.Comment: Proceedings of the Low Radioactivity Techniques 2015 workshop, March 2015, Seattle (US

Analysis of backgrounds for the ANAIS-112 dark matter experiment

The ANAIS (Annual modulation with NaI(Tl) Scintillators) experiment aims at the confirmation or refutation of theDAMA/LIBRA positive annual modulation signal in the low energy detection rate, using the same target and technique, at the Canfranc Underground Laboratory (LSC) in Spain. ANAIS-112, consisting of nine 12.5 kg NaI(Tl) modules produced by Alpha Spectra Inc. in a 3x3matrix configuration, is taking data smoothly in "dark matter search" mode since August, 2017, after a commissioning phase and operation of the first detectors during the last years in various setups. A large effort has been carried out withinANAIS to characterize the background of sodium iodide detectors, before unblinding the data and performing the first annual modulation analysis. Here, the background models developed for all the nine ANAIS-112 detectors are presented. Measured spectra from threshold to high energy in different conditions are well described by the models based on quantified activities independently estimated following several approaches. In the region from 1 to 6 keVee the measured, efficiency corrected background level is 3.58+-0.02 keV-1 kg-1 day-1; NaI crystal bulk contamination is the dominant background source being 210Pb, 40K, 22Na and 3H contributions the most relevant ones. This background level, added to the achieved 1 keVee analysis threshold (thanks to the outstanding light collection and robust filtering procedures developed), allow ANAIS-112 to be sensitive to the modulation amplitude measured by DAMA/LIBRA, and able to explore at three sigma level in 5 years the WIMP parameter region singled out by this experiment.Comment: Final version for publicatio